FIFTH REPORT OF THE DIRECTOR I908 I9I 



folded plate of Cambric rocks has been pushed along- a slightly 

 inclined fault ' plain from the east over the Lower Siluric rocks, 

 and that the outlier of Stockbridge limestone does not rest in 



a small syncline of the Cambric, as it would seem, but pro- 

 trudes from below the Cambric or is a " Fenster," as the Euro- 

 pean geologists term it (an outlier of younger rock protrud- 

 ing through older rock in consequence of extensive over- 

 thrust and partial weathering away of the overthrusted mass). 

 We have attempted in Museum bulletin 42 [1901. p. 556] 

 to indicate this condition for the Albany region. If we assume 

 this overthrust to have still more approached the horizontal 

 and the transportation along the thrust plane to have been quite 

 extensive, we get conditions which seem to explain many of the 

 greater phenomena of the slate belt. We insert here a section, 

 given by Dale, from the neighborhood of Schodack Landing, south 



